KR102614489B1 - Dust measuring device - Google Patents

Abstract

In order to accurately measure the dust concentration in two spaces but minimize the possibility of noise generation, a dust sensor, a main housing for mounting the dust sensor and providing an internal space, are formed at two points of the main housing to connect the external and internal spaces. a first external hole and a second external hole, a first fan and a second fan provided at positions corresponding to each of the first external hole and the second external hole and driven to form a flow rate from the outside to the internal space; A dust measuring device is provided, comprising a control unit that selectively drives the first fan or the second fan.

Description

Dust measuring device {DUST MEASURING DEVICE}

The present invention relates to a dust measuring device capable of measuring dust concentrations in two or more spaces.

Dust sensors are used to measure the amount of dust in a particular air. To accurately measure the amount of dust, the air being measured must be allowed to pass through the dust sensor.

Therefore, a dust measuring device equipped with a dust sensor includes a structure that introduces or exhausts external air into the dust sensor.

There are two important components in the air inlet/exhaust structure of a dust measurement device: a configuration that introduces external air and a configuration that forms a flow path for the incoming air to reach or escape the dust sensor.

At this time, in order to clearly measure the dust status of the outside air, a device is needed to introduce outside air at a certain flow rate and flow rate, and it is necessary to minimize the inflow of air from unintended areas.

A typical configuration that introduces external air is a fan or compressor. A fan or compressor creates a pressure difference between the inside and outside of the dust measuring device, causing air to flow in or out.

In principle, one dust sensor measures the air condition in one space, but it can also measure the air condition in two or more areas with a time difference.

The present invention is premised on measuring air conditions in two or more spatial areas.

When it is necessary to measure the dust concentration in the air in two spaces, you want to know the difference in dust concentration between the inside and outside air of a car, or in the case of an air purifier, you want to know the difference in dust concentration between the air entering the air purifier and the air coming out of the air purifier. For example, you may want to do so.

In order to measure the air condition, that is, the dust concentration, of these two physically separated spaces, a dust measuring device connected to each external space may be provided.

However, in some cases, it is possible to measure the air quality in two spaces with a single dust measurement device. The present invention describes a dust measuring device that can be used in these cases.

There are several things to consider when measuring the dust concentration of two or more spaces using a single dust measurement device.

First, the responsiveness of dust measurement in each space must be good. Good dust measurement responsiveness means that you can immediately determine if you want to measure dust in each space. In other words, it means the degree to which you can immediately determine if you want to measure the air condition in the second space while measuring the air condition in the first space. The better the response, the less noise in the measured values.

Second is the reliability of the sealing of the air flow path. If air from another space flows into the path where air flows into the dust sensor through a fan or pump, noise will occur and accurate measurement values cannot be obtained, so it is necessary to completely seal the space in that path.

Alternatively, the degree of airtightness or sealing of the dust measurement device may affect the flow rate or flow rate of air, which may result in differences or noise in the dust concentration measurement value.

Third is the simplification of the structure. If the dust measurement device becomes complex and bulky, it is appropriate to simplify the structure because sealing must be done at multiple points, which can increase costs.

The purpose of the present invention is to solve the above-mentioned problem of increased costs arising from accurately measuring dust concentrations in two spaces.

According to one aspect of the present invention to achieve the above or other objects, there is provided a dust sensor, a main housing for mounting the dust sensor and providing an internal space, and each formed at two points of the main housing to connect the external and internal spaces. a first external hole and a second external hole, a first fan and a second fan provided at positions corresponding to each of the first external hole and the second external hole and driven to form a flow rate from the outside to the internal space; A dust measuring device is provided, comprising a control unit that selectively drives the first fan or the second fan.

In addition, according to another aspect of the present invention, a dust measuring device is provided, wherein the first fan is provided outside the first external hole, and the second fan is provided outside the second external hole.

Additionally, according to another aspect of the present invention, the first external hole is connected to an external first space, the second external hole is connected to an external second space, and the external first space and the external second space are A dust measuring device characterized in that it is partitioned is provided.

In addition, according to another aspect of the present invention, the dust sensor includes a first internal hole and a second internal hole formed on both sides of a sensing path penetrating the dust sensor, and a sensing unit provided at a point on the sensing path, , a first vent bracket forming a sealed path between the first inner hole and the first outer hole, and a second vent bracket forming a sealed path between the second inner hole and the second outer hole. It provides a dust measuring device comprising:

In addition, according to another aspect of the present invention, a dust measuring device is provided, further comprising mesh filters provided in the first vent bracket and the second vent bracket.

In addition, according to another aspect of the present invention, a first sealing bracket is coupled to the outside of the first fan to form a path through which air flows in from the outside, and a first sealing bracket is coupled to the outside of the second fan to form a path through which air flows in from the outside. It provides a dust measuring device, characterized in that it further includes a second sealing bracket forming a.

In addition, according to another aspect of the present invention, a support bracket supporting rotation of each of the first fan and the second fan, a coupling hole formed in the support bracket, and a protruding fixing part provided in the main body housing and coupled to the coupling hole. It further includes a dust measuring device, wherein the support bracket and the main body housing are spaced apart from each other.

In addition, according to another aspect of the present invention, a dust sensor having an inlet and an outlet, a Venturi tube forming a path connected to the inlet of the dust sensor, and a Venturi tube formed at a point of the venturi tube to create an external first space A first tube hole forming a path flowing into the Venturi tube, a second tube hole formed at another point of the Venturi tube forming a path flowing into the Venturi tube from an external second space, the outside air hole, or A dust measuring device comprising a third fan provided in the vent hole and driven to form a flow rate in the venturi pipe, and a control unit that drives the third fan when the pressure of the venturi pipe is lower than the first pressure. to provide.

In addition, according to another aspect of the present invention, the fourth fan is mounted and is provided with a first inlet through which air having a flow rate formed by the fourth fan flows in, a second inlet, and an outlet through which the introduced air flows out. A fourth fan mounting unit, a first dust sensor having an inlet connected to an external first space and an outlet connected to the first inlet, and a second dust sensor having an inlet connected to an external second space and an outlet connected to the second inlet A dust measuring device including a sensor is provided.

In addition, according to another aspect of the present invention, a dust sensor forming a sensing path, a first hole and a second hole formed on both sides of the sensing path of the dust sensor, and provided on either side of the first hole or the second hole. It includes a two-way fan and a control unit that drives the two-way fan to selectively have a flow direction, and forms an air flow path in the order of an external first space, the dust sensor, the two-way fan, and an external second space. A dust measuring device is provided, characterized in that an air flow path is formed in the following order: an external second space, the dust sensor, the two-way fan, and an external first space.

The effects of the dust measuring device according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, there is an advantage that the dust concentration in the air of two spaces can be measured with one device.

Additionally, according to at least one of the embodiments of the present invention, there is an advantage in that the responsiveness of dust concentration measurement can be improved.

Additionally, according to at least one of the embodiments of the present invention, there is an advantage that noise generated when measuring dust concentration can be minimized.

Additionally, according to at least one of the embodiments of the present invention, there is an advantage in that high responsiveness can be achieved at low cost.

In addition, according to at least one of the embodiments of the present invention, there is an advantage that the accuracy of measurement can be increased by removing other foreign substances in the air that are not of interest.

Further scope of applicability of the present invention will become apparent from the detailed description that follows. However, since various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, the detailed description and specific embodiments such as preferred embodiments of the present invention are understood to be given only as examples. It has to be.

Figure 1 briefly shows an embodiment of a conventional dust measuring device.
Figure 2 is a block diagram for explaining a dust measuring device related to the present invention.
Figure 3 schematically shows one form of Example 1.
Figure 4 shows a specific form of the dust measuring device of the first embodiment.
Figure 5 shows a specific form of the dust measuring device of the first embodiment.
Figure 6 shows an example of a dust sensor related to the present invention.
Figure 7 is a cross-sectional view taken along line AA' of Figure 4.
Figure 8 is an exploded perspective view of the coupling area of the support bracket of the present invention.
Figure 9 is a front view of the coupling area of the support bracket of the present invention.
Figure 10 schematically shows one form of Example 2.
Figure 11 schematically shows one form of Example 3.
Figure 12 schematically shows one form of Example 4.

Dust sensors are used to measure the amount of dust in a particular air. To accurately measure the amount of dust, the air being measured must be allowed to pass through the dust sensor.

Therefore, a dust measuring device equipped with a dust sensor includes a structure that introduces or exhausts external air into the dust sensor.

There are two important components in the air inlet/exhaust structure of a dust measurement device: a configuration that introduces external air and a configuration that forms a flow path for the incoming air to reach or escape the dust sensor.

At this time, in order to clearly measure the dust status of the outside air, a device is needed to introduce outside air at a certain flow rate and flow rate, and it is necessary to minimize the inflow of air from unintended areas.

A typical configuration that introduces external air is a fan or compressor. A fan or compressor creates a pressure difference between the inside and outside of the dust measuring device, causing air to flow in or out.

In principle, one dust sensor measures the air condition in one space, but it can also measure the air condition in two or more areas with a time difference.

The present invention is premised on measuring air conditions in two or more spatial areas.

When it is necessary to measure the dust concentration in the air in two spaces, you want to know the difference in dust concentration between the inside and outside air of a car, or in the case of an air purifier, you want to know the difference in dust concentration between the air entering the air purifier and the air coming out of the air purifier. For example, you may want to do so.

In order to measure the air condition, that is, the dust concentration, of these two physically separated spaces, a dust measuring device connected to each external space may be provided.

However, in some cases, it is possible to measure the air quality in two spaces with a single dust measurement device. The present invention describes a dust measuring device that can be used in these cases.

There are several things to consider when measuring the dust concentration of two or more spaces using a single dust measurement device.

First, the responsiveness of dust measurement in each space must be good. Good dust measurement responsiveness means that you can immediately determine if you want to measure dust in each space. In other words, it means the degree to which you can immediately determine if you want to measure the air condition in the second space while measuring the air condition in the first space. The better the response, the less noise in the measured values.

Second is the reliability of the sealing of the air flow path. If air from another space flows into the path where air flows into the dust sensor through a fan or pump, noise will occur and accurate measurement values cannot be obtained, so it is necessary to completely seal the space in that path.

Alternatively, the degree of airtightness or sealing of the dust measurement device may affect the flow rate or flow rate of air, which may result in differences or noise in the dust concentration measurement value.

Third is the simplification of the structure. If the dust measurement device becomes complex and bulky, it is appropriate to simplify the structure because sealing must be done at multiple points, which can increase costs.

Figure 1 briefly shows an embodiment of a conventional dust measuring device 600.

A conventional dust measuring device 600 for measuring dust in two spaces includes a dust sensor 610 having an inlet 611 and an outlet 612 and selectively introducing air in the first space and air in the second space. It may include a solenoid valve 630 that can be used.

Here, the first space and the second space may mean two physically partitioned spaces. For example, in the case of a dust measuring device installed in a car, the first space may be outdoor air and the second space may be indoor air. This concept applies equally to the embodiments of the present invention below.

The solenoid valve 630 selectively introduces air from two spaces. When measuring dust in the first space, the inlet 632 from the second space is blocked, and when measuring dust in the second space, the inlet 631 from the first space is blocked.

The solenoid valve 630 has a complex structure and has the disadvantage of being expensive to provide.

A conventional dust measuring device includes a fan 640 at the outlet 612 of the dust sensor 610 to generate force to introduce dust from the first space or the second space. The fan 640 generates a flow rate from the inlet 611 of the dust sensor 610 to the outlet 612. That is, the fan 640 generates a relatively lower pressure difference between the inlet 611 and the outlet 612 of the dust sensor 610 at the outlet 612 side than at the inlet 611 side.

In addition to the fan, a pump, etc. may be used, and the same applies to embodiments of the present invention described later.

The air in the first space and the second space forms a flow rate toward the dust sensor 610 due to the pressure difference generated by the fan 640 located on the outlet 612 side of the dust sensor 610. Space, for example, the first space inlet 631a and the second space inlet 631b of the solenoid valve 630, or the inlet 621 or outlet of the sensor mounting unit 620 on which the dust sensor 610 is mounted. There is a risk that air may flow in from 622 and mix with the air in the first or second space.

This generates noise in the air quality measurement results.

In addition, due to the characteristics of the solenoid valve 630, the first space inlet 631a and the second space inlet 631b must be opened and closed selectively. For the above purpose, when measuring dust in the first space, The inflow path must be completely sealed, that is, sealed, and conversely, when measuring dust in the second space, the inflow path from the first space must be sealed.

This sealing structure increases costs, so it is necessary to minimize the area requiring sealing.

Below, we will describe a dust measurement device with high accuracy at low cost by minimizing this sealing structure and implementing a simple structure.

Figure 2 is a block diagram for explaining the dust measuring device 100 related to the present invention.

The dust measuring device 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 130, an output unit 140, an interface unit 150, a memory 160, a control unit 170, and a power supply unit ( 180), etc. may be included.

The components shown in FIG. 2 are not essential for implementing the dust measurement device 100, so the dust measurement device 100 described herein may include more or less components than the components listed above. You can have it.

More specifically, among the above components, the wireless communication unit 110 is between the dust measurement device 100 and the wireless communication system, between the dust measurement device 100 and another external terminal, or between the dust measurement device 100 and an external server. It may include one or more modules that enable wireless communication between the devices. Additionally, the wireless communication unit 110 may include one or more modules that connect the dust measurement device 100 to one or more networks.

This wireless communication unit 110 may include at least one of a wireless Internet module 111, a short-range communication module 112, and a location information module 113.

The short-range communication module 112 is for short-range communication, including Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, and NFC. Short-distance communication can be supported using at least one of (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies. This short-range communication module 112 is between the dust measurement device 100 and a wireless communication system, between the dust measurement device 100 and another dust measurement device 100, or between the dust measurement device 100 through wireless area networks. Wireless communication can be supported between the measurement device 100 and a network where another dust measurement device 100 or an external server is located. The short-range wireless communication networks may be wireless personal area networks.

Here, the other external terminal is a mobile terminal or wearable device (for example, a smartwatch) capable of exchanging data with (or interoperable with) the dust measuring device 100 according to the present invention. It can be glass (smart glass) or HMD (head mounted display). The short-range communication module 112 may detect (or recognize) a mobile terminal or wearable device capable of communicating with the dust measurement device 100 around the dust measurement device 100 . Furthermore, if the detected mobile terminal or wearable device is a device authenticated to communicate with the dust measuring device 100 according to the present invention, the control unit 170 controls at least a portion of the data processed by the dust measuring device 100, It can be transmitted to a mobile terminal or wearable device through the short-range communication module 112. Accordingly, a user of a mobile terminal or wearable device can use the data processed by the dust measurement device 100 through the mobile terminal or wearable device. Alternatively, the dust measurement device 100 may receive processed data through a mobile terminal or wearable device and perform a specific operation.

For example, data on skin condition measured by the dust measuring device 100 is transmitted to a mobile terminal or wearable device, and the data is converted into a database to identify trends in skin condition changes and feed back based on this to drive the dust measuring device. can be controlled.

In particular, the dust measuring device 100 according to the present invention includes Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), Short-distance communication technologies such as Wireless USB (Wireless Universal Serial Bus) may be applied.

Among these, the NFC module provided in the dust measuring device 100 supports non-contact short-range wireless communication between terminals at a distance of about 10 cm. The NFC module can operate in any of card mode, reader mode, and P2P mode. In order for the NFC module to operate in card mode, the dust measuring device 100 may further include a security module that stores card information. Here, the security module may be a physical medium such as a Universal Integrated Circuit Card (UICC) (e.g., Subscriber Identification Module (SIM) or Universal SIM (USIM)), Secure micro SD, and a sticker, or a logical medium embedded in the dust measurement device. (For example, it may be embedded SE (Secure element)). Data exchange based on SWP (Single Wire Protocol) can occur between the NFC module and the security module.

When the NFC module is operated in card mode, the dust measuring device 100 can transmit the stored card information to the outside like a traditional IC card.

When the NFC module is operated in reader mode, the dust measurement device can read data from an external tag. At this time, the data that the dust measurement device receives from the tag may be coded in the NFC Data Exchange Format defined by the NFC Forum. In addition, the NFC Forum defines four record types. Specifically, the NFC Forum defines four Record Type Definitions (RTDs): Smart Poster, Text, Uniform Resource Identifier (URI), and General Control.

When the NFC module is operated in P2P (Peer-to-Peer) mode, the dust measurement device 100 can perform P2P communication with other devices. At this time, LLCP (Logical Link Control Protocol) may be applied to P2P communication. For P2P communication, a connection may be created between the dust measuring device 100 and another external terminal. At this time, the created connection can be divided into a connectionless mode, which terminates after exchanging one packet, and a connection-oriented mode, which continuously exchanges packets. Through P2P communication, data and setup parameters for Bluetooth and Wi-Fi connections can be exchanged. However, since the available distance of NFC communication is short, P2P mode can be effectively used to exchange small data.

The location information module 113 is a module for acquiring the location (or current location) of the dust measurement device 100, and representative examples thereof include a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, if the dust measuring device 100 utilizes a GPS module, the location of the dust measuring device 100 can be acquired using signals sent from GPS satellites. As another example, when the dust measuring device 100 utilizes a Wi-Fi module, the dust measuring device 100 is based on information from the Wi-Fi module and a wireless AP (Wireless Access Point) that transmits or receives wireless signals. location can be obtained. If necessary, the location information module 115 may replace or additionally perform any of the functions of other modules of the wireless communication unit 110 to obtain data regarding the location of the dust measuring device 100. The location information module 115 is a module used to acquire the location (or current location) of the dust measurement device 100, and is not limited to a module that directly calculates or obtains the location of the dust measurement device 100. .

The input unit 120 includes a camera 121 or an image input unit for inputting an image signal, and a user input unit 122 (for example, a touch key, a mechanical key, etc.) for receiving information from a user. may include. Image data collected by the input unit 120 may be analyzed and processed as a user's control command.

The camera 121 processes image frames such as still images or moving images obtained by an image sensor in video call mode or shooting mode. The processed image frame may be displayed on the display unit 141 or stored in the memory 160.

The camera 121 includes at least one of a camera sensor (eg, CCD, CMOS, etc.), a photo sensor (or image sensor), and a laser sensor.

The camera 121 and the laser sensor can be combined with each other to detect the touch of the sensing object for a 3D stereoscopic image. A photo sensor can be laminated on the display element, and this photo sensor is configured to scan the movement of a detection object close to the touch screen. More specifically, the photo sensor mounts photo diodes and TR (transistors) in rows/columns and scans the contents placed on the photo sensor using electrical signals that change depending on the amount of light applied to the photo diode. In other words, the photo sensor calculates the coordinates of the sensing object according to the amount of change in light, and through this, location information of the sensing object can be obtained.

The camera 121 provided in the dust measuring device 100 may perform the function of photographing the surface condition of the skin to which it is attached. If the display unit 141 is provided, the photographed skin surface condition can be output so that the user can check it.

The user input unit 122 is for receiving information from the user. When information is input through the user input unit 122, the control unit 170 can control the operation of the dust measuring device 100 to correspond to the input information. there is. This user input unit 122 is a mechanical input means (or mechanical key, for example, a button, dome switch, or jog wheel located on the front, rear, or side of the dust measuring device 100). , jog switch, etc.) and a touch input means. As an example, the touch input means consists of a virtual key, soft key, or visual key displayed on the touch screen through software processing, or a part other than the touch screen. It can be done with a touch key placed in . Meanwhile, the virtual key or visual key can be displayed on the touch screen in various forms, for example, graphic, text, icon, video or these. It can be made up of a combination of .

The sensing unit 130 may include one or more sensors for sensing at least one of information within the dust measuring device 100, information on the surrounding environment surrounding the dust measuring device 100, and user information. For example, the sensing unit 130 includes a proximity sensor (131), an illumination sensor (132), a touch sensor, an acceleration sensor, a magnetic sensor, and a gravity sensor. Sensor (G-sensor), gyroscope sensor, motion sensor (133, motion sensor), RGB sensor, infrared sensor (IR sensor), fingerprint scan sensor, ultrasonic sensor sensor), optical sensor (e.g., camera 121), microphone, battery gauge, environmental sensor (e.g., barometer, hygrometer, thermometer, radiation detection sensor, heat detection) sensor, gas detection sensor, etc.), and a chemical sensor (e.g., electronic nose, healthcare sensor, biometric sensor, etc.). Meanwhile, the dust measuring device 100 disclosed in this specification can utilize information sensed by at least two of these sensors by combining them.

The sensing unit 130 senses at least one of information within the dust measuring device 100, information on the surrounding environment surrounding the dust measuring device 100, and user information, and generates a sensing signal corresponding thereto. Based on these sensing signals, the control unit 170 may control the driving or operation of the dust measuring device 100, or may perform data processing, functions, or operations related to an application installed on the dust measuring device 100.

The proximity sensor 131 refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or an object existing nearby without mechanical contact using the power of an electromagnetic field or infrared rays. The proximity sensor 131 may be placed in the inner area of the dust measuring device 100 surrounded by the touch screen as seen above or near the touch screen.

Examples of the proximity sensor 131 include a transmissive photoelectric sensor, a direct reflection photoelectric sensor, a mirror reflection photoelectric sensor, a high-frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. When the touch screen is capacitive, the proximity sensor 131 may be configured to detect the proximity of a conductive object by changing the electric field according to the proximity of the object. In this case, the touch screen (or touch sensor) itself can be classified as a proximity sensor.

Meanwhile, for convenience of explanation, the act of approaching an object on the touch screen without touching it so that the object is recognized as being located on the touch screen is called "proximity touch," and the touch The act of actually touching an object on the screen is called “contact touch.” The position at which an object is close-touched on the touch screen means the position at which the object corresponds perpendicularly to the touch screen when the object is close-touched. The proximity sensor 131 can detect proximity touch and proximity touch patterns (e.g., proximity touch distance, proximity touch direction, proximity touch speed, proximity touch time, proximity touch position, proximity touch movement state, etc.). there is. Meanwhile, the control unit 170 processes data (or information) corresponding to the proximity touch operation and proximity touch pattern detected through the proximity sensor 131, as described above, and further provides visual information corresponding to the processed data. It can be output on the touch screen. Furthermore, the control unit 170 may control the dust measurement device 100 so that different actions or data (or information) are processed depending on whether a touch to the same point on the touch screen is a proximity touch or a contact touch. there is.

The touch sensor detects a touch (or touch input) applied to the touch screen (or display unit 141) using at least one of several touch methods such as resistive method, capacitive method, infrared method, ultrasonic method, and magnetic field method. sense

As an example, a touch sensor may be configured to convert changes in pressure applied to a specific part of the touch screen or capacitance occurring in a specific part into an electrical input signal. The touch sensor may be configured to detect the position, area, pressure at the time of touch, capacitance at the time of the touch, etc., at which the touch object that touches the touch screen is touched on the touch sensor. Here, the touch object is an object that applies a touch to the touch sensor, and may be, for example, a finger, a touch pen or stylus pen, or a pointer.

The control unit 170 may perform different controls or the same control depending on the type of touch object that touches the touch screen (or touch keys provided other than the touch screen). Whether to perform different controls or the same controls depending on the type of touch object may be determined depending on the current operating state of the dust measuring device 100 or the application program being executed.

Meanwhile, the touch sensor and proximity sensor discussed above are used independently or in combination to provide short (or tap) touch, long touch, multi touch, and drag touch on the touch screen. ), flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, etc. Touch can be sensed.

An ultrasonic sensor can recognize the location information of a sensing object using ultrasonic waves. Meanwhile, the control unit 170 is capable of calculating the location of the wave source through information sensed from an optical sensor and a plurality of ultrasonic sensors. The location of the wave generator can be calculated using the property that light is much faster than ultrasonic waves, that is, the time for light to reach the optical sensor is much faster than the time for ultrasonic waves to reach the ultrasonic sensor. More specifically, the location of the wave source can be calculated using the time difference between the arrival time of the ultrasonic waves using light as a reference signal.

In this way, when there is a touch input to the touch sensor, the corresponding signal(s) are sent to the touch controller. The touch controller processes the signal(s) and then transmits the corresponding data to the control unit 170. As a result, the control unit 170 can determine which area of the display unit 141 has been touched. Here, the touch controller may be a separate component from the control unit 170 or may be the control unit 170 itself.

The output unit 140 is for generating output related to vision, hearing, or tactile sensation, and includes at least one of a display unit 141, an audio output unit 142, a haptic module 143, and an optical output unit 144. can do. The display unit 141 can implement a touch screen by forming a layered structure or being integrated with the touch sensor. This touch screen functions as a user input unit 122 that provides an input interface between the dust measuring device 100 and the user, and can simultaneously provide an output interface between the dust measuring device 100 and the user.

The display unit 141 displays (outputs) information processed by the dust measuring device 100. For example, the display unit 141 may display execution screen information of an application running on the dust measuring device 100, or UI (User Interface) and GUI (Graphic User Interface) information according to this execution screen information. there is.

The interface unit 150 serves as a passageway for various types of external devices connected to the dust measuring device 100. This interface unit 150 connects devices equipped with a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, and an identification module. It may include at least one of the ports. In response to the external device being connected to the interface unit 150, the dust measuring device 100 may perform appropriate control related to the connected external device.

The memory 160 stores data supporting various functions of the dust measuring device 100. The memory 160 may store a plurality of application programs (application programs or applications) running on the dust measuring device 100, data for operating the dust measuring device 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Additionally, at least some of these applications may exist on the dust measurement device 100 from the time of shipment for the basic functions of the dust measurement device 100. Meanwhile, the application program is stored in the memory 160, installed on the dust measuring device 100, and driven by the control unit 170 to perform the operation (or function) of the dust measuring device 100. there is.

In addition to operations related to the application program, the control unit 170 typically controls the overall operation of the dust measuring device 100. The control unit 170 can provide or process appropriate information or functions to the user by processing signals, data, information, etc. input or output through the components discussed above, or by running an application program stored in the memory 160.

The control unit 170 may control at least some of the components examined with FIG. 2 in order to run an application program stored in the memory 160. Furthermore, the control unit 170 may operate at least two of the components included in the dust measuring device 100 in combination with each other in order to drive the application program.

The power supply unit 180 receives external power and internal power under the control of the control unit 170 and supplies power to each component included in the dust measuring device 100. This power supply unit 180 includes a battery, and the battery may be a built-in battery or a replaceable battery.

At least some of the above components may operate in cooperation with each other to implement the operation, control, or control method of the dust measurement device 100. Additionally, the operation, control, or control method of the dust measuring device may be implemented on the dust measuring device by running at least one application program stored in the memory 160.

- Example 1 -

In order to measure the air conditions of the two spaces, a dust measuring device 200 may be provided that shares the same flow path but is independently equipped with a fan to generate a flow rate in the direction pushed to the dust sensor.

Figure 3 schematically shows one form of Example 1.

The dust sensor 210 may be mounted on the main housing 220 of the dust measuring device 200. The main housing 220 may mount the dust sensor 210 and form at least a portion of the entire flow path of the dust measuring device 200 at the same time.

The main housing 220 is provided with a first external hole 221a and a second external hole 221b. The first external hole 221a and the second external hole 221b are formed at two points of the main housing 220, and the first external hole 221a is located at the first internal hole 211a of the dust sensor 210. , the second external hole 221b may be connected to the second internal hole 211b of the dust sensor 210.

The first external hole 221a is connected to the external first space, and the second external hole 221b is connected to the external second space. At this time, the external first space and the external second space may be partitioned.

The first fan 240a is provided at a position corresponding to the first external hole 221a, and the second fan 240b is provided at a position corresponding to the second external hole 221b. Corresponding here means that the first fan 240a is provided to generate an air flow rate from the first external hole 221a to the dust sensor 210, and the second fan 240b is provided to form the second external hole 221b. ) means that it is provided to form an air flow rate from the dust sensor 210.

That is, the first fan 240a is provided between the first space and the dust sensor 210 to create a pressure difference so that the air in the first space flows to the dust sensor 210, and the second fan 240b is the second fan 240b. It is provided between the space and the dust sensor 210 to create a pressure difference so that the air in the second space flows to the dust sensor 210. That is, each fan 240 can apply force in a direction to pull external air to the fan's location and push the pulled external air back to the dust sensor.

The arrangement of the fan 240, which generates a force in the form of pushing air toward the dust sensor 210, has an advantage in terms of the sealing structure.

In the above-described fan arrangement structure, it is sufficient to consider only the sealing from the external space to the point where air is pulled to the fan 240.

For example, when air flows from the external first space toward the first fan 240a, the first external hole 221a, and the first internal hole 211a of the dust sensor 210, the first internal hole 211a from the external first space It is sufficient to implement a sealing structure to prevent air from entering only up to the fan 240a.

This is because, in the area after that, that is, the area where the force that pushes the air drawn in by the fan 240 acts, the air to be measured (here, the air in the first external space) may leak through the unsealed gap, but there is no external unintentional effect. This is because there is no risk of air (air from the external second space, etc.) flowing in.

Conversely, this also applies when a flow rate is formed from the external second space toward the second fan 240b, the second external hole 221b, and the second internal hole 211b of the dust sensor 210. In other words, it is sufficient to implement a sealing structure to prevent air from other spaces from flowing in from the external second space to the second fan 240b.

For this reason, the first fan 240a may be provided outside the first external hole 221a, and the second fan 240b may be provided outside the second external hole 221b. That is, when each fan 240 is provided inside the external hole 221, sealing of the external hole 221 must be implemented.

The control unit of the dust measuring device 200 can selectively measure the dust state of the air in the external first space or the air in the external second space by selectively driving the first fan 240a or the second fan 240b. . When measuring the air dust concentration in the external first space, the first fan (240a) is driven and the second fan (240b) is not driven, and when measuring the air dust concentration in the external second space, the second fan (240b) is driven. It can be controlled to drive and not to drive the first fan 240a.

If it is desired to measure the dust concentration in both the external first space and the external second space, the first fan 240a and the second fan 240b can be driven at different times and the results can be obtained.

The control unit needs to measure the dust concentration in the air for the flow rate generated by the driven fan 240. In other words, since the dust sensor 210 does not independently detect the direction of air flow, the control unit must distinguish and respond to this. The more certain the change in dust measurement results due to the change in air flow direction, the easier it is for the control unit to distinguish it.

The size and rotation speed of the fan 240 can be factors that determine the air flow rate along with the size and shape of the path forming the flow rate, which affects accurate dust measurement. In other words, it is necessary to optimize the air flow rate for accurate dust measurement.

Figures 4 and 5 show a specific form of the dust measuring device 200 of the first embodiment.

Figure 4 is a combined perspective view of the dust measuring device 200 related to the present invention, and Figure 5 is an exploded perspective view of the dust measuring device 200 related to the present invention.

The main housing 220 may have a polyhedral shape, such as a rectangular parallelepiped.

The main housing 220 may include two surfaces facing each other, and the first external hole 221a and the second external hole 221b may be formed on the two facing surfaces. The first external hole 221a and the second external hole 221b may be particularly provided in parallel.

That is, the best form is for the first external hole 221a and the second external hole 221b to be provided on the same line.

When the first external hole 221a and the second external hole 221b are provided on the same line, fluid such as air flows from the first external hole 221a to the second external hole 221b and the second external hole 221b. ) can minimize the occurrence of unintended turbulence when flowing from the first external hole 221a, which means that the above-mentioned responsiveness is improved.

The main housing 220 may be provided in the form of a seating portion 2201 forming a mounting portion in the recessed area and a cap 2202 covering the seating portion 2201. When the cap 2202 covers the seating portion 2201, the area excluding the first external hole 221a and the second external hole 221b is sealed. Here, sealed does not mean that it is completely sealed so that air cannot escape or enter, but rather that it is blocked from the outside to the extent that it does not significantly interfere with the flow rate in other intended areas.

In the present invention, both sealing and sealing are blocked to the extent that objects such as objects cannot pass through, but sealing is in a state where small particles such as air or dust can enter and exit, and sealing is in a state in which small particles such as air or dust can enter and exit. It may mean a state where entry is not possible. In other words, sealing can be a more limited concept of airtightness.

The dust sensor 210 may be mounted on the main housing 220 in the form of being mounted on the mounting board 251. The mounting board 251 may be directly or indirectly connected to the main board 252. A control unit that controls the dust sensor 210 or the operation of the fan may also be provided on the main board 252. The control unit may be provided as a chip in the form of an AP (Application Processor). The main housing 220 may also be equipped with a battery that serves as a power supply.

The mounting board 251 and the main board 252 may be fixed to the seating guide portion 253 formed in the main body housing 220. The seating guide portion 253 may have a shape corresponding to the boundary area of the mounting board 251 or the main board 252.

Figure 6 shows an example of a dust sensor 210 related to the present invention.

The dust sensor 210 may be provided optically as described above. In other words, the relative amount of dust in the incoming air can be optically sensed.

The dust sensor 210 may have a sensing path 214 through which air and dust pass. The holes on both sides that serve as the inlet or outlet of the sensing path 214 may be the first inner hole 211a and the second inner hole 211b described above.

The sensing unit 213, which measures the relative amount of dust by irradiating light, is provided at a point on the sensing path 214 formed by the first internal hole 211a and the second internal hole 211b.

When air flows in both directions along the sensing path of the dust sensor 210, each of the first inner hole 211a and the second inner hole 211b performs both the inlet and outlet functions.

Air containing dust flows in the order of the first internal hole 211a, the sensing unit, and the second internal hole 211b, and the dust state of the air flowing in from the first internal hole 211a can be measured, and conversely, the dust state of the air flowing in from the first internal hole 211a can be measured. The dust state of the air flowing in from the second inner hole 211b while flowing through the inner hole 211b, the sensing unit 213, and the first inner hole 211a in that order may be measured.

The dust sensor may be provided with additional holes such as the third internal hole 217. The third inner hole 217 may be provided to facilitate access to the sensing unit 213 by forming a wider opening than the first inner hole 211a and the second inner hole 211b.

Recognition accuracy can be improved by cleaning the sensing unit 213 through the third internal hole 217.

The third internal hole 217 may be mounted in the main housing 220 in an open state, but may also be closed to minimize the possibility of noise generation, if necessary. At this time, blocking can be implemented by tape or the like.

The dust concentration measurement accuracy of the dust sensor 210 may vary depending on the flow rate and flow rate of the incoming air, as well as the stability of the above factors. Therefore, in order to increase the accuracy of dust concentration measurement, an appropriate flow rate and flow rate of incoming air are required, and these appropriate conditions must be continuously maintained.

FIG. 7 is a cross-sectional view taken along the line A-A' of FIG. 4.

For convenience, see Figures 4 and 5 together.

The vent bracket 270 connects the internal hole 211 provided in the dust sensor 210 and the external hole 221 provided in the main housing 220 to form a path through which air flows.

The vent bracket 270 may include a first vent bracket 270a and a second vent bracket 270b. The first vent bracket 270a forms a path between the first inner hole 211a and the first outer hole 221a, and the second vent bracket 270b forms a path between the second inner hole 211b and the second outer hole. (221b) forms a path between.

The vent bracket 270 may affect the flow rate and flow rate of air from the outer hole 221 to the inner hole 211 or from the inner hole 211 to the outer hole 221.

Specifically, the vent bracket 270 forms a fluid path between the external hole 221 and the internal hole 211 to prevent unnecessary air flow to other areas of the internal space of the main housing 220.

Additionally, the vent bracket 270 has a vent hole 271 that is a flow path from the outer hole 221 to the inner hole 211. The vent hole 271 may have a specific cross-sectional shape to affect the flow rate and flow rate.

When the cross-sectional area of the vent hole 271 of the vent bracket 270 decreases from the outer hole 221 to the inner hole 211, it plays the role of a nozzle and moves from the outer hole 221 to the inner hole 211. ), if the cross-sectional area increases, it can play the role of a diffuser.

The shape of the vent hole 271 of the vent bracket 270 is determined not only by the shape and size of the flow path between the outer hole 221 and the inner hole 211, but also the resulting shape and size of the outer hole 221 and the inner hole 211. is decided.

The vent bracket 270 may be provided as a replacement type that can be applied differently depending on need.

The vent bracket 270 may be provided with a mesh filter to perform a filtering function. The mesh filter serves to prevent substances other than those being measured from entering and damaging the device or generating noise in the measurement results.

Mesh filters can also affect flow rate and flow rate by simultaneously affecting the cross-sectional area through which air and dust enter or exit.

The vent bracket 270 may be coupled from the outside of the main housing 220 toward the inner hole 211 and fixed to the inner hole 211 .

The vent bracket 270 is provided with a locking portion 272, and an extension portion is formed on the outer surface of the main body housing 220, especially the fan seating portion 290, in an area corresponding to the locking portion 272 of the vent bracket 270. By forming 223, the engaging portion 272 of the vent bracket 270 can be fixed. Fixation of both configurations can be implemented by a fitting method.

The fan 240 may be provided outside the external hole 221. The fan 240 serves to introduce air from the external space into the internal space of the main housing 220, particularly into the vent bracket 270 and the sensing path 214 to the dust sensor 210.

As described above, the first fan 240a is provided at a point corresponding to the first external hole 221a, and the second fan 240b is provided at a point corresponding to the second external hole 221b. In particular, the first fan 240a may be provided outside the first external hole 221a, and the second fan 240b may be provided outside the second external hole 221b.

The fan 240 may be fixed to the main housing 220 through a support bracket 280. The support bracket 280 may provide a rotation axis for each of the first fan 240a and the second fan 240b.

The fan seating portion 290 fixes the support bracket 280. The fan seating portion 290 forms an outer wall that protrudes from the outer surface of the main body housing 220 to form an inner space, and the support bracket 280 can be fixed by fitting into the inner space.

The sealing bracket 260 protects the fan 240 and the support bracket 280 from being directly exposed to the outside. The sealing bracket 260 is provided in a shape corresponding to the outer surface 292 of one end of the outer wall of the fan seating portion 290 of the main body housing 220 and can be coupled to the main housing 220 including the fan seating portion 290. You can.

The ceiling bracket 260 forms a flow path from the external space to the fan 240. The shape and size of the sealing bracket 260 affect the flow rate and flow rate of air flowing into the dust sensor 210.

The air in the internal space 262 of the ceiling bracket 260 flows into the fan 240, and the internal space inevitably has an area large enough to surround the outside of the fan 240 or the support bracket 280, which is This may be a limitation in properly controlling the flow rate and volume of air. The inlet hole 261 overcomes the structural limitations of the sealing bracket 260.

The inflow hole 261 forms a hole that protrudes outward from the sealing bracket 260 and connects the external space with the internal space 262 of the sealing bracket 260.

The inlet hole 261 may have a width smaller than the inner space 262 of the sealing bracket 260. That is, the shape extending from the small-width inlet hole 261 to the large-width internal space 262 of the sealing bracket 260 serves as a diffuser for incoming air. The diffuser shape can slow the flow rate of air reaching the fan 240. The air pressure or flow rate of the external space is not a factor that can be controlled by the dust measuring device 100, and therefore, the flow rate or flow rate flowing into the dust sensor 210 may change unintentionally due to the air pressure or flow rate of the external space. The diffuser shape minimizes the influence of these variables.

In particular, the shape with a width that rapidly increases from the inlet hole 261 to the inner space 262 of the sealing bracket 260 generates turbulence, making it possible to appropriately control the high flow rate and flow rate from the external space.

The width of the above-described inlet hole 261 and the inner space 262 of the sealing bracket 260 is based on one direction perpendicular to the direction of the flow path. The concept of width described above may be replaced by the concept of cross-sectional area. That is, the characteristics regarding the relationship between the widths of the inlet hole 261 and the inner space 262 of the sealing bracket 260 can be equally applied to the cross-sectional area of the flow path.

Through the above features, the influence of the condition of the external space is minimized, and the size and shape of the vent hole 261 and the vent bracket 270, as well as the rotation speed of the fan 240, are controlled to control the external air at an appropriate flow rate and By introducing it at a flow rate, the accuracy of measuring the dust concentration of the dust sensor 210 can be increased.

The inlet hole 261 has a protruding pillar-shaped outer surface, so that components such as a connecting tube can be additionally combined to extend the flow path.

As described above, in Example 1, the fan 240 serves to push air from the external space to the dust sensor 210, so it is sufficient to consider only the sealing of the flow path area reaching from the external space to the fan 240.

In this respect, sealing the gap between the inlet hole 261 and the sealing bracket 260 is required.

In particular, when the inlet hole 261 and the sealing bracket 260 are injected as one piece, the sealing work for the gap between the inlet hole 261 and the sealing bracket 260 can be omitted. However, if the inlet hole 261 of the sealing bracket 260 is directly exposed to the external space containing the air of the object to be measured, separate sealing is not required, but the above-mentioned separate connecting tube, etc. are combined to indirectly expose the external space to the outside space. When exposed to space, additional sealing is required in the gap between the connecting tube and the sealing bracket 260.

If the negative pressure generated by the fan 240 affects the gap between the sealing bracket 260 and the fan seat 290, air from other areas may flow into this gap, so additional sealing in this area is required. do.

Figure 8 is an exploded perspective view of the coupling area of the support bracket 280 of the present invention, and Figure 9 is an exploded front view of the coupling area of the support bracket 280 of the present invention.

Driving the fan 240 may cause vibration not only in the support bracket 280 but also in the entire main housing 220 to which the support bracket 280 is fixed, and a structure that can minimize this is required.

First, at least one side of the two components in contact within the dust measuring device 100 may have a material that functions as a buffer, or a cushioning material may be added between the two components in contact.

For example, since the vibration of the fan 240 can be transmitted between the vent bracket 270 and the extension part 223, the material that makes up the vent bracket 270 can have a buffering function. For example, the vent bracket 270 may include an elastic material. Representative examples may include rubber.

Second, the contact area of two components in contact within the dust measuring device 100 can be minimized.

For example, in order to minimize the vibration of the support bracket 280 generated by the driving of the fan 240 to the main housing 220, the contact area between the support bracket 280 and the main housing 220 may be minimized. You can.

To implement this, a coupling hole 281 is formed in the support bracket 280, and a protruding fixing part 291 is provided in the main body housing 220 so that they can be fixed to each other. In other words, the vibration generated can be minimized by allowing only a portion of the outer surface of the support bracket 280 to contact the main housing 220 rather than the entire outer surface.

Accordingly, the support bracket 280 and the main body housing 220 may be provided to be spaced apart from each other in areas excluding the protruding fixing part 291 and the coupling hole 281.

The support bracket 280 and the main housing 220 may be in contact through screw coupling. In other words, it can be coupled through the provision of a screw and a screw hole instead of the protruding fixing part 291 and the coupling hole 281, which has a similar effect to the case of coupling using the protruding fixing part 291 and the coupling hole 281. You can get it.

-Example 2-

Example 2 measures air and dust in two spaces using a venturi tube. Unlike Example 1, Example 2 measures the air condition in either the first space or the second space, measures the mixed air condition in the first space and the second space, and measures the air condition in the remaining space through the difference. do.

Figure 10 schematically shows one form of Example 2.

In particular, Figure 10 shows an example in Example 2 in which a fan is provided in a path leading from the second external space. However, in some cases, a fan may be provided in the path leading from the external first space.

The venturi tube 330 is connected to the inlet 311 of the dust sensor 310. The venturi tube 330 may include a first tube hole 331 that forms a path flowing from the external first space into the venturi tube, and a second tube forming a path flowing into the venturi tube from the external second space. It may include a hole 332.

Here, the dust sensor 310 has the same form as the dust sensor 210 in Embodiment 1, unless otherwise specified. However, the dust sensor 310 of Example 2 may perform sensing in one direction rather than in both directions.

Each air introduced through the first tube hole 331 or the second tube hole 332 may have a structure in which the air is mixed in the venturi tube 330. The mixed air of the two spaces may come out through the outlet 333 of the venturi tube 330 and flow into the inlet of the dust sensor 310 described above.

The air flowing in through the inlet 311 of the dust sensor 310 flows out through the outlet of the dust sensor to measure the air condition.

When the pressure is high, that is, when the speed of the incoming air is high, the venturi tube 330 releases all the air from the external first space and the external second space through the first tube hole 331 and the second tube hole 332. It can be brought in. On the other hand, when the pressure is low, that is, when the speed of the incoming air is small, air from one space of the first tube hole 331 and the second tube hole 332 is introduced.

That is, the dust state of the mixed air in the first space and the second space is compared with the dust state of the air in one of the first space and the second space to calculate the air state of both the first space and the second space.

The third fan 340 is provided on one side of the first tube hole 331 or the second tube hole 332 to create a flow rate in the venturi tube 330. The third fan 340 adjusts the flow rate in the direction pushing the dust sensor 310 so that air flows into the second tube hole 332 when the pressure of the venturi tube 330 is low, that is, when the speed of the incoming air is low. form

As described above, assuming that the pressure is low, when the third fan 340 is provided in the first tube hole 331, air in the first space flows into the venturi tube 330 and the dust sensor 310. If the third fan 340 is provided in the second tube hole 332, the air in the second space will flow into the venturi tube 330 and the dust sensor 310.

If the boundary value of whether the pressure is low or high is the first pressure, the control unit drives the third fan 340 when the pressure is below the first pressure, and operates the third fan 340 when the pressure exceeds the first pressure. may not run.

Embodiment 2, like Embodiment 1, generates pressure in the direction of pushing external air to the dust sensor 310 through the fan 340, so only the air flowing from the external space to the third fan 340 is a different space. It is sufficient to seal it to prevent air from entering.

- Example 3 -

One of the dust measuring devices for measuring the air conditions of two spaces may include a dust measuring device 400 equipped with two sensors and one fan.

Figure 11 schematically shows one form of Example 3.

The first dust sensor 410a may measure the air condition of the first external space, and the second dust sensor 410b may measure the air condition of the second external space.

The outlet of the first dust sensor 410a and the outlet of the second dust sensor 410b both form flow rates by the fourth fan 440.

The fourth fan mounting unit 430 mounts the fourth fan 440 forming a flow rate, and has a first inlet 431a and a second inlet through which air having a flow rate formed by the fourth fan 440 flows in. 431b) is provided. The outlet of the first dust sensor 410a is connected to the first inlet 431a, and the outlet of the second dust sensor 410b is connected to the second inlet 431b.

In this embodiment, since two sensors 410a and 410b are used, the first dust sensor 410a and the second dust sensor 410b can be used simultaneously, thereby minimizing measurement time.

In addition, in the path through which air flows to each dust sensor 410a and 410b, the air in the external first space and the air in the external second space do not mix, so the room for noise generation can be minimized.

The first dust sensor 410a and the second dust sensor 410b may be provided on one substrate 420. The first dust sensor 410a and the second dust sensor 410b mounted on the substrate 420 can be controlled by one control unit and can receive power from one power supply unit.

- Example 4 -

Example 4 takes the form of a dust measuring device 500 equipped with a bi-directional fan capable of selectively forming flow rates in both directions.

Figure 12 schematically shows one form of Example 4.

The dust sensor 510 may be provided at one point of the entire air flow path.

At this time, measurement in both directions is possible with the dust sensor 510. A first hole 512a and a second hole 512b are provided on both sides of the sensing path 511 of the dust sensor 510. The first hole 512a on one side of the sensing path 511 of the dust sensor 510 is provided on the external first space side with respect to the sensing unit, and the second hole 512b on the other side of the sensing path 511 is provided on the external first space side with respect to the sensing unit. 2 It is located on the space side.

The bidirectional fan 540 is provided on either the first hole 512a or the second hole 512b.

The two-way fan 540 is provided in the two-way fan mounting part 530, one side 531a of the two-way fan mounting part 530 is connected to the external first space, and the two-way fan mounting part 530 The other side 531b may be provided to be connected to the external second space.

Conceptually, it may be understood that one side of the flow rate formed by the two-way fan 540 is connected to the external first space, and the other side is connected to the external second space.

Figure 12 shows the air flow path in the order of the external first space, the dust sensor 510, the two-way fan 540, and the external second space, but the external second space, the dust sensor 510, and the two-way fan The air flow path may be formed in that order (540) and the external first space.

When measuring the air condition of the external first space, the control unit drives the two-way fan 540 so that a flow rate is formed in the direction from the external first space to the external second space. Conversely, when measuring the air condition of the external second space, the control unit drives the two-way fan 540 to form a flow rate in the direction from the external first space to the external second space. The bidirectional fan 549 is driven so that a flow rate is formed from the second space to the external first space.

This embodiment has the advantage of having a relatively simple structure because the air conditions in two spaces can be measured with one dust sensor and one fan.

However, based on the dust sensor 510, the two-way fan performs both the role of sucking in and expelling air. Therefore, based on the above-mentioned reasons, it is necessary to perfectly seal each point.

It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

The above detailed description should not be construed as restrictive in any respect and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

100: Dust measuring device 200: First embodiment dust measuring device
210: dust sensor 211: inner hole
211a: first inner hole 211b: second inner hole
213: sensing unit 214: sensing path
215: mounting board 216: power supply terminal
217: Third inner hole 220: Main housing
2201: Seating part 2202: Cap
221: external hole 221a: first external hole
221b: second external hole 223: expansion part
240: fan 240a: first fan
240b: second fan 252: main board
253: Seating guide part 260: Ceiling bracket
260a: first ceiling bracket 260b: second ceiling bracket
261: Inlet hole 262: Interior space of sealing bracket
270: Bent bracket 270a: First vent bracket
270b: second vent bracket 271: vent hole
272: Hook 280: Support bracket
280a: first support bracket 280b: second support bracket
281: Coupling hole 290: Fan seating portion
291: Protruding fixing part 292: Fan seating part outer wall once outer surface
300: Second embodiment dust measuring device 310: Dust sensor
311: Dust sensor inlet 330: Venturi tube
331: first tube hole 332: second tube hole
333: Venturi tube outlet 340: Third fan
400: Third embodiment dust measuring device 410a: First dust sensor
410b: second dust sensor 420: substrate
430: fourth fan mounting unit 431a: first inlet
431b: second inlet 440: fourth fan
500: Fourth embodiment dust measuring device 510: Sensing unit
511: sensing path 512a: sensing path first hole
512b: second sensing path hole 530: bidirectional fan mounting unit
531a: One side of the two-way fan mounting part 531b: The other side of the two-way fan mounting part
540: Bidirectional fan 610: Conventional dust sensor
611: Conventional dust sensor inlet 612: Conventional dust sensor outlet
620: Conventional dust sensor mounting part 621: Mounting part entrance
622: Mounting unit outlet 630: Solenoid valve
631a: First space entrance 631b: Second space entrance
640: fan

Claims (10)

A dust sensor including a first inner hole formed on both sides of a sensing path, a second inner hole, and a sensing unit provided at a point on the sensing path;
a main housing that mounts the dust sensor and provides an internal space;
a first external hole and a second external hole formed at two points of the main housing to connect the external and internal spaces;
a first fan and a second fan provided at positions corresponding to each of the first and second external holes and driven to form a flow rate from the outside toward the inside space;
a control unit that selectively drives the first fan or the second fan;
a first vent bracket forming a sealed path between the first inner hole and the first outer hole;
a second vent bracket forming a sealed path between the second inner hole and the second outer hole; and
A dust measuring device comprising a mesh filter provided on the first vent bracket and the second vent bracket. According to claim 1,
The first fan is provided outside the first external hole, and the second fan is provided outside the second external hole. According to claim 1,
The first external hole is connected to an external first space, and the second external hole is connected to an external second space,
A dust measuring device, characterized in that the external first space and the external second space are partitioned. delete delete According to claim 1,
a first sealing bracket coupled to the outside of the first fan to form a path through which air flows in from the outside; and
The dust measuring device further includes a second sealing bracket coupled to the outside of the second fan to form a path through which air flows in from the outside. According to claim 1,
a support bracket supporting rotation of each of the first and second fans;
a coupling hole formed in the support bracket; and
It further includes a protruding fixing part provided in the main body housing and coupled to the coupling hole,
A dust measuring device, wherein the support bracket and the main housing are spaced apart from each other. A dust sensor having an inlet and an outlet;
A Venturi tube forming a path connected to the inlet of the dust sensor;
a first tube hole formed at one point of the venturi tube to form a path through which an external first space flows into the venturi tube;
a second tube hole formed at another point of the venturi tube to form a path through which an external second space flows into the venturi tube;
a third fan provided in the first tube hole and driven to create a flow rate in the venturi tube; and
A dust measuring device comprising a control unit that drives the third fan to introduce air in the first space into the first tube hole when the pressure of the venturi tube is lower than the first pressure.
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